Hot springs resort · Japan
Niimi Onsen
Japan · 6.7 miles south of Iwanai
Last updated
- Type
- Resort Hot springs resort
- Water temperature
- 158°F (70°C) at the source
- Cost
- Not recorded
- Hours or season
- Not recorded
- Clothing
- Not recorded
- Nearest town
- Iwanai (7 mi / 11 km)
- Coordinates
- Pools or sources
- 1
- Scalding: recorded at 50°C or above. Water at this temperature causes burns in seconds.
About Niimi Onsen
Niimi Onsen is a hot springs resort in Japan, about 6.7 miles south of Iwanai. The nearest large city is Otaru, roughly 31 miles away as the crow flies.
The temperature at the source has been recorded at 158°F (70°C). That puts it in the "too hot to enter at the source" range. Water this hot can burn skin quickly. Soaking pools are usually cooled by mixing with creek or tap water. Never enter the source itself. At developed sites the soaking pools are normally cooled to a comfortable level, so the pools you sit in will be cooler than this figure.
As a resort, it offers managed pools and visitor facilities. Expect to pay for entry or a room, and book ahead at busy times.
Water temperature
Too hot to enter at the source. Water this hot can burn skin quickly. Soaking pools are usually cooled by mixing with creek or tap water. Never enter the source itself.
Readings come from OpenStreetMap mappers, and other public sources. Temperatures change with season, flow and pool design. See our soak temperature guide for safe soaking times.
Map and directions
Red marks Niimi Onsen. Other colored dots are nearby springs in this directory. Coordinates: 42.88206, 140.54747.
Getting there
- Nearest town: Iwanai. The spring is about 6.7 miles (11 km) south of town in a straight line.
- Nearest large city: Otaru, about 31 miles (50 km) in a straight line.
- Planning from a city? See hot springs near Hakodate, Japan.
- Use the directions buttons above for a driving route. Final roads to many springs are unpaved, seasonal or closed in winter, so check road conditions before you go.
Hot springs near Niimi Onsen
Before you go
- Check the operator, land manager or park website for current hours, fees and closures. Details in any directory can go out of date.
- Keep your head above water. Warm fresh water can carry Naegleria fowleri, a rare but deadly amoeba that enters through the nose.
- Drink water, limit soaks to 10 to 20 minutes at a time in very hot water, and skip alcohol.
- Read our hot spring etiquette guide and safety guide.
Frequently asked questions
How hot is Niimi Onsen?
The temperature at the source has been recorded at 158°F (70°C), which is too hot to enter at the source. Water this hot can burn skin quickly. Soaking pools are usually cooled by mixing with creek or tap water. Never enter the source itself.
Where is Niimi Onsen?
Niimi Onsen is in Japan, about 6.7 miles south of Iwanai. The GPS coordinates are 42.8821, 140.5475.
What hot springs are near Niimi Onsen?
The closest listed spring is Yukichichibu Onsen, about 2.7 miles east. Niseko Weiss Hotel is about 6.5 miles away.
What should I bring to a hot spring?
Water to drink, a towel, sandals with grip, a bag to pack out trash, and warm layers for after your soak. At primitive springs bring a headlamp and tell someone where you are going.
Sources and corrections
This listing combines OpenStreetMap. Data last refreshed August 2026. Source 1 Source 2 Source 3
Visited recently? Send a correction, such as a temperature reading, fee, closure or photo. If you look after this spring and want it removed, see removal requests.